水介质Blumlein型螺旋脉冲形成线的研究

Water-dielectric Blumlein type of PFL with spiral line

分析了螺旋线脉冲形成线脉宽加宽的原理,利用程序对Blumlein型螺旋脉冲形成线进行了模拟研究,模拟结果与理论分析得到的脉宽表达式吻合较好,并可以给出螺旋线中筒的电场和磁场分布。加工了一套Blumlein型螺旋脉冲形成线,并开展实验研究,解决了绝缘支撑耐压问题,得到充电电压550 kV,二极管电压500 kV,电流28 kA,半高宽128 ns的脉冲输出。

The spiral line was analyzed through a simple theory, the code simulation and the experimental test. The pulse width of spiral forming line was widened comparing with that of non-spiral forming line, which could be determined by a simple formula and be testified by the results of the code simulation. According to the theory and the code simulation, a water-dielectric Blumlein type of PFL with spiral line was built up and the insulated underlay of spiral line was designed carefully to improve the charging voltage. The experiments were carried out using diode load. As a typical result, a pulse output with a diode voltage of 500 kV and a diode current of 28 kA with an FWHM （full width of half maximum） of 128 ns was obtained when the charging voltage of PFL was up to 550 kV.